Provide access to surface meshes for different parcellations

[dickscheid]

The meshes are currently maintained as neuroglancer mesh format on atlas VMs. The library needs to be able to forard the site URL, read them and also convert them to commonly used python data structures.

relevant trello card: https://trello.com/c/69JRHucS/65-provide-access-to-labelled-meshes-via-python-and-api-to-support-new-julich-brain-version-and-freesurfer

[dickscheid]

We have to start with a list of all meshes and mesh types in use to find the common denominator, then make a design draft.

[xgui3783]

• neuroglancer single scale precomputed mesh spec
• gifti spec
• vtk
• waveform obj
• minc obj

[pacher]

• STL

[xgui3783]

proposal: use trimesh, perhaps add a loader (locally or upstream) for ng mesh format